Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Working toward ‘smart windows’

Sarbajit Banerjee stands in front of a scanning electron microscopy image of tungsten-doped vanadium-oxide nanowires, which have a phase transition temperature close to room temperature. Photo: DOUGLAS LEVERE
Sarbajit Banerjee stands in front of a scanning electron microscopy image of tungsten-doped vanadium-oxide nanowires, which have a phase transition temperature close to room temperature. Photo: DOUGLAS LEVERE

Abstract:
New materials science research at UB could hasten the creation of "smart" windows that reflect heat from the sun on hot summer days, but let in the heat in colder weather.

The findings concern a unique class of synthetic chemical compounds that are transparent to infrared light at lower temperatures, but undergo a phase transition to begin reflecting infrared when they heat up past a certain point.

Working toward ‘smart windows’

Buffalo, NY | Posted on April 18th, 2011

An article detailing some of these discoveries appeared last week on the cover of the Journal of Physical Chemistry Letters. Additional papers have appeared online or in print in CrystEngComm, the Journal of Materials Chemistry and Physical Review B.

In the papers, UB researchers report they have managed to manipulate the trigger temperature for vanadium oxide, one such material. The advance is a crucial step toward making the compound useful for such applications as coatings for energy-saving windows.

By preparing vanadium oxide as a nanomaterial instead of in bulk, the scientists managed to lower the compound's trigger point from 153 degrees Fahrenheit to 90. Doping vanadium oxide nanowires with tungsten brought the temperature down further, to 7 degrees Fahrenheit. Molybdenum doping had a similar, but smaller, effect.

Researchers also found that they were able to induce a phase transition using an electric current instead of heat.

UB chemist Sarbajit Banerjee led the studies, collaborating with Sambandamurthy Ganapathy, UB assistant professor of physics, to head the Physical Review B research on the use of the electric current.

"Definitely, we are closer than we've ever been to being able to incorporate these materials into window coatings and other systems that sense infrared light," says Banerjee, assistant professor in the UB Department of Chemistry. "What we found is an example of how much of a difference finite size can make. You have a material like vanadium oxide, where the phase transition temperature is too high for it to be useful, and you produce it as a nanomaterial and you can then use it right away."

Banerjee and Ganapathy previously led research projects demonstrating that, in nanoscale form, two additional synthetic compounds—copper vanadate and potassium vanadate—exhibit phase transitions akin to those in vanadium oxide.

Banerjee's work has caught the attention of the National Renewable Energy Laboratory, which has contacted him to discuss developing window coatings that could improve the energy efficiency of buildings with heating or air conditioning systems. The technology could be particularly useful in places like Phoenix and Las Vegas that experience extreme summer temperatures.

Besides smart windows, vanadium oxide also could be useful in products including computer chips, night-vision instruments and missile-guidance systems, Banerjee said.

Two major awards are funding Banerjee's research on the material: A Cottrell Scholar Award from the Research Corporation for Science Advancement, announced this year, and a National Science Foundation CAREER award, the foundation's most prestigious award for junior investigators.

Both honors recognize Banerjee's accomplishments in teaching, as well as in research. He has mentored numerous graduate students, including Luisa Whittaker, Christopher J. Patridge and Jesus M. Velazquez, who appear as first authors on some of Banerjee's papers on vanadium oxide. Tai-lung Wu, supervised by Ganapathy, is the first author of the Physical Review B paper.

####

For more information, please click here

Contacts:
Sarbajit Banerjee
Chemistry
(716) 645-4140

Copyright © University of Buffalo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Watch a video of Sarbajit Banerjee talking about his “smart window” research.

Related News Press

News and information

Oxford Instruments and Dresden High Magnetic Field Laboratory collaborate to develop HTS magnet technology components for high field superconducting magnet systems June 29th, 2016

Texas A&M Chemist Says Trapped Electrons To Blame For Lack Of Battery Efficiency: Forget mousetraps — today’s scientists will get the cheese if they manage to build a better battery June 28th, 2016

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Videos/Movies

'On-the-fly' 3-D print system prints what you design, as you design it June 1st, 2016

Revealing the nature of magnetic interactions in manganese oxide: New technique for probing local magnetic interactions confirms 'superexchange' model that explains how the material gets its long-range magnetic order May 25th, 2016

Programmable materials find strength in molecular repetition May 23rd, 2016

Graphene makes rubber more rubbery May 23rd, 2016

Discoveries

Texas A&M Chemist Says Trapped Electrons To Blame For Lack Of Battery Efficiency: Forget mousetraps — today’s scientists will get the cheese if they manage to build a better battery June 28th, 2016

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Materials/Metamaterials

Superheroes are real: Ultrasensitive nonlinear metamaterials for data transfer June 25th, 2016

Coexistence of superconductivity and charge density waves observed June 23rd, 2016

GraphExeter illuminates bright new future for flexible lighting devices June 23rd, 2016

Soft decoupling of organic molecules on metal June 23rd, 2016

Announcements

Oxford Instruments and Dresden High Magnetic Field Laboratory collaborate to develop HTS magnet technology components for high field superconducting magnet systems June 29th, 2016

Texas A&M Chemist Says Trapped Electrons To Blame For Lack Of Battery Efficiency: Forget mousetraps — today’s scientists will get the cheese if they manage to build a better battery June 28th, 2016

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Energy

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

FEI and University of Liverpool Announce QEMSCAN Research Initiative: University of Liverpool will utilize FEI’s QEMSCAN technology to gain a better insight into oil and gas reserves & potentially change the approach to evaluating them June 22nd, 2016

Home

Industrial Nanotech, Inc. Expands Distribution Network in US and Internationally May 9th, 2016

A View Through Wood Shows Futuristic Applications: Transparent wood made at UMD could create new windows, cars and solar panels May 5th, 2016

All powered up: UCI chemists create battery technology with off-the-charts charging capacity April 21st, 2016

Transparent wood could one day help brighten homes and buildings March 31st, 2016

Construction

Finding a new formula for concrete: Researchers look to bones and shells as blueprints for stronger, more durable concrete May 26th, 2016

Nanotechnology is changing everything from medicine to self-healing buildings: Nanotechnology is so small it's measured in billionths of metres, and it is revolutionising every aspect of our lives April 2nd, 2016

New type of nanowires, built with natural gas heating: UNIST research team developed a new simple nanowire manufacturing technique February 1st, 2016

SiC Nanoparticles Applied to Modify Properties of Portland Cement January 14th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic